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Here's another!! Wondering why do I work here?

I have a client who replaced his air handler due to the age and the cost to replace his evap coil due to it leaking. He bought a 2 ton Trane horizontal air handler from me and the company I work for, and let me tell you we are not the cheapest around by a long shot I sell on our quality installs and our awesome service. I get my last call of the day today and it is for this client. His complaint is the unit is not cooling properly. It was just installed less than a week ago. I figured maybe the drain line or something silly like that. I arrive out there and climb into the attic and see this
I just sighed and said "oh boy here we go again" we installed a 3 ton R-410A knock off Trane air handler on a 2 ton XLI Trane R-22 condenser. I was so embarrassed to go and tell my client that we dropped the ball on him and we will return tomorrow morning with the correct unit. This is the kind of client everyone wishes for, no shopping around no beating you up on price, just says go ahead and do what ever you have to do and pays his bills up front in advance.
I just wanted to share my frustration with you guys and vent a little.
The topic says here's another. Wondering why I work here is because this happens a lot not so much the wrong unit but lazy techs, lazy installers, tons of call backs. The money is extremely good is probably why I have been sticking it out here for over 8 years. But it is getting really old!!

I get that but really the whole problem to me is the bait and switch that had happened. I agree change the metering device and maybe lower the fan speed but I would only do that if another company installed it and the client had no other way of making it right. And that would be after I slammed the other company really well but really though if any other tech would of came behind another company and seen this, I think they would of raised a red flag.
And on another note my install manager and others in the company are saying that a 410 air handler will work fine with R-22. I don't agree but that's what they are saying:/ lol oh well!!
What do you think??

everytime we do a new coil with r-22 cond. it always comes with 410a metering device txv or orifice, we always take it out and install an r-22 txv for the correct tonnage had no problems with that... except the 410a coils seem to be leaking quicker and quicker installed a brand new 410a system in place of 22 and the coil leaked after 2 yrs!!!! had this happen many a times with carrier